What "Franchise/Chain" sporting goods stores are in your area?
Dick's Sporting Goods has a big sale going right now, with some NEW Mossbergs under $300. Gander Mountain and Cabellas are also decent places to look, most of the time [special sales, etc] Not sure if Dunham's Sporting Goods exists in your locale, but they frequently have both Mossbergs and Mavericks on sale.